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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-11-15 18:29:08 +0100 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-11-25 04:53:15 +0100 |
| commit | 184cd4a3b962a4769889615430eaf40076b97969 (patch) | |
| tree | dc1df367a9a3e5b641f480a2e9a729a337762492 /arch/powerpc/kernel/pci_dn.c | |
| parent | powerpc/powernv: Fixup p7ioc PCIe root complex class code (diff) | |
| download | linux-184cd4a3b962a4769889615430eaf40076b97969.tar.xz linux-184cd4a3b962a4769889615430eaf40076b97969.zip | |
powerpc/powernv: PCI support for p7IOC under OPAL v2
This adds support for p7IOC (and possibly other IODA v1 IO Hubs)
using OPAL v2 interfaces.
We completely take over resource assignment and assign them using an
algorithm that hands out device BARs in a way that makes them fit in
individual segments of the M32 window of the bridge, which enables us
to assign individual PEs to devices and functions.
The current implementation gives out a PE per functions on PCIe, and a
PE for the entire bridge for PCIe to PCI-X bridges.
This can be adjusted / fine tuned later.
We also setup DMA resources (32-bit only for now) and MSIs (both 32-bit
and 64-bit MSI are supported).
The DMA allocation tries to divide the available 256M segments of the
32-bit DMA address space "fairly" among PEs. This is done using a
"weight" heuristic which assigns less value to things like OHCI USB
controllers than, for example SCSI RAID controllers. This algorithm
will probably want some fine tuning for specific devices or device
types.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/pci_dn.c')
| -rw-r--r-- | arch/powerpc/kernel/pci_dn.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/pci_dn.c b/arch/powerpc/kernel/pci_dn.c index 4e69deb89b37..dd9e4a04bf79 100644 --- a/arch/powerpc/kernel/pci_dn.c +++ b/arch/powerpc/kernel/pci_dn.c @@ -50,6 +50,9 @@ void * __devinit update_dn_pci_info(struct device_node *dn, void *data) dn->data = pdn; pdn->node = dn; pdn->phb = phb; +#ifdef CONFIG_PPC_POWERNV + pdn->pe_number = IODA_INVALID_PE; +#endif regs = of_get_property(dn, "reg", NULL); if (regs) { /* First register entry is addr (00BBSS00) */ |